public void AddContract(Contract contract, bool update)
{
// Searching for the contract number in the contract's XML file (returns 0 if not found)
int temp = (from n in DataSourceXml.Contracts.Elements()
where int.Parse(n.Element("ContractNumber").Value) == contract.ContractNumber
select int.Parse(n.Element("ContractNumber").Value)).FirstOrDefault();
if (temp != 0)
{
throw new Exception("ERROR: It's not a new contract !!!");
}
else
{
if (!update) // Makes sure that we don't updates an exist contract
{
int theLastContractNumber = FIRST_SERIAL_CONTRACT;
if (DataSourceXml.Contracts.Elements().Any())
{
// Finds the number of the last contract that added
theLastContractNumber = (from n in DataSourceXml.Contracts.Elements()
select int.Parse(n.Element("ContractNumber").Value)).Max();
}
contract.ContractNumber = theLastContractNumber + 1; // Update the current contract number
}
DataSourceXml.Contracts.Add(contract.toXML());
DataSourceXml.SaveInContracts();
}
}
public void RemoveContract(int contractNumber)
{
// Searching for the contract instance in the contract's XML file (returns null if not found)
XElement contractToRemove = (from n in DataSourceXml.Contracts.Elements()
where int.Parse(n.Element("ContractNumber").Value) == contractNumber
select n).FirstOrDefault();
if (contractToRemove == null)
{
throw new Exception("ERROR: The contract with serial number: " + contractNumber + " not exist in the database !!!");
}
else
{
contractToRemove.Remove();
DataSourceXml.SaveInContracts();
}
}